Dust-guard.



H. & P. MARTIN.

DUST GUARD.

APPLIOATION FILED SEPT. 10, 1907.

Patented Dec. 8, 1908.

HENRY MARTIN AND PAUL MARTIN-OF ST. PAUL, MINNESQTA.

DU'STFGUARD.

Specification of Letters Patent.

Patented Dec. 8, 1908.

Application filed September 10, 1907. Serial No. 892,117.

To all whom it may concern:

Be it known that we, HENRY MARTIN and PAUL MARTIN, citizens of the United States, residing at St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Dust-Guards; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object to provide an improved dust guard for car journals, which, while extremely simple in construction and of small cost, is highly eflicient for the purposes had in View.

To the above ends the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claim.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figure 1 is a view partly in side elevation but chiefly in vertical section, showing the improved dust guard applied to a car axle and journal box. Fig. 2 shows the improved dust guard in face elevation, removed from working position. Fig. 3 is an edge elevation of the guard shown in Fig. 2. Fig. 4 is a vertical section taken on the line in w of Fig. 2; and Fig. 5 is a view partly in plan and partly in horizontal section on the line 00 00 of Fig. 1, some parts being broken away.

The journal box 1, which may be of the usual or any suitable construction, is provided at its inner end with laterally spaced vertical webs or walls 2 having axle passages 3. The walls 2 are spaced apart so as to form a guard receiving pocket 4 between them, which pocket is open at its top. The reduced journal or end 5 of the axle 6 is projected into the journal box in the usual way through the passages 3. V

The body of the dust guard is preferably in the form of a fiat wooden plate 7, the cross-grained ends of which, as shown, are reinforced by inset wooden strips 7 a to prevent warping of the said plate. This body plate 7 is provided with a large central opening 8 through which the journal section 5 of the axle 6 works with considerable clearance. This journal portion 5 is directly engaged by an annular packing strip which is secured to the body plate 7 of the plate 7 by a multiplicity of tacks.

dust guard. This annular joint strip is preferably made up of overlapped flexible sections 9 of heavycanvas, leather or similar material that is secured to the said body This flexible joint strip produces but very slight friction upon the journal section 5 but, nevertheless, forms a dust-tight joint between the same and the body plate 7 of the dust guard.

To the opposite vertical edges of the body plate 7 are attached laterally acting springs that hold the outer face of said plate 7 pressed tightly against the inner surface of the outer web 2 of the box and thus form a dust-tight joint between these parts. These springs, as shown in the drawings, are each made from a single piece of spring wire 10, preferably spring steel. The intermediate portions of these spring wires 10 are turned around into intermediately located headed studs or pins 11 applied to the vertical edges of the body plate 7. The ends of said spring wires 10 are bent to form bows 12 that project laterally beyond the inner face of the body plate 7. Just inward of their bowed portions 12, the said springs 10 press against stop pins or projections 13 applied to the vertical edges of the body plate 7. The extreme ends of the bows 12 of the springs 10, it will be noted, lie within the plane of the body plate 7.

hen the dust guard is placed in working position within the pocket 4 of the journal box, as shown in Figs. 1 and 5, the bowed portions 12 of the springs press against the inner web 2 of the journal box and exert a force which, as already indicated, keeps the outer face of the body plate 7 tightly pressed against the outer web 2 of the said box. By these two springs and their four spring bows 12, the dust guard is, therefore, pressed at four different points against the cooperating box web 2. Furthermore, the above described arrangement of the spring bows 12 makes it a very easy matter to insert the dust guard into the upper end of the pocket 4. When the dust guard is thus inserted and pressed downward,.the said spring bows 12 cam themselves into position with the said pocket.

The dust guard described is, as is evident, extremely simple and may be manufactured at small cost. In actual practice it has been found highly efficient for the purposes had in View.

What we claim is:

The combination with an axle and an axle box, said box having an open dust guard receiving pocket, of a dust guard comprising a flat body plate seated in said pocket and surrounding said axle, a flexible annular joint strip secured to said body plate and engaging said axle, and a pair of springs 10 anchored at their intermediate portions to the opposite edges of said guard plate and formed with reversely projecting bowed end portions 12 engageable with one of the walls of said pocket and serving to press said body plate against the other wall of said pocket, and the free ends of which bowed portions 12 lie within the plane of said body plate so as to prevent the same from catching on the box in applying the dust guard within the pocket thereof, substantially as described. I y

In testimony whereof We affix our signatures in presence of two witnesses.

HENRY MARTIN. PAUL MARTIN.

Witnesses:

AnoLrl-r GIESEN, EDW. JUNGBAUER. 

